Heating and hot water supply device

A heating and hot water supply device, comprising a combustion means, a main heat exchanger, a circulation passage connected to said main heat exchanger and a heating apparatus, a circulation pump provided in the circulation passage, a first bypass passage that branches off from the circulation passage and bypasses the heating apparatus, a heat exchanger for hot water supply provided in the first bypass passage, and a hot water supply passage for supplying cold water to the heat exchanger for hot water supply, and for supplying hot water heated by the heat exchanger for hot water supply, wherein:

• a distribution means is provided at a branching portion of the first bypass passage, and the distribution means is capable of adjusting a distribution ratio so that heating operation, or hot water supply operation, or simultaneous heating operation and hot water supply operation become possible;
• a second bypass passage that bypasses the heat exchanger for hot water supply is provided in the hot water supply passage, and a flow rate adjustment means is provided that is capable of adjusting a bypass flow rate flowing in the second bypass passage;
• and
• the heat exchanger for hot water supply is constituted with a plate type heat exchanger, with a pair of connection portions of the first bypass passage and a pair of connection portions of the hot water supply passage being disposed on one side portion thereof.